Which of the Following Is True Regarding the Ability of Persons

Which of the following is true regarding the ability of persons suffering from a mental illness to enter into a binding contract?

A) Persons suffering from a mental illness never have capacity to enter into a binding contract.
B) Persons suffering from a mental illness have full capacity to enter into a binding contract so long as they do not present a danger to themselves or others.
C) Persons suffering from a mental illness have full capacity to enter into a binding contract so long as they inform the other party that they are in treatment.
D) Persons suffering from a mental illness may have full, limited, or no legal capacity to enter into a binding contract depending on the nature and extent of their mental deficiency.
E) Persons who suffer from a mental illness always have full capacity to enter into a binding contract.